There is a really nice men's club in San Jose (Watergarden) with outdoor pool and spa. Perfect setting to wear sexy swimwear gear or nothing at all, which is what I do when I go there to tan when San Francisco is fogged in.
Try San Gregorio Beach. I used to drive down from SF to go there. Quiet and mostly gay. You can wear anything or nothing at all.
Below is a Yelp review of the beach. Read through the comments for accurate directions and information. The entrance to the gay/nude part is north of the real beach.
https://www.yelp.com/biz/san-gregorio-beach-south-coastside?osq=gay+nude+beach